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Watching people debate market efficiency always makes me more of a believer in market efficiency
For instance if someone is using strong form market efficiency as a straw man to attack the overall idea, you know that they aren't serious about the concept at hand
. @CliffordAsness with clearest attempt to reconcile markets being mostly efficient, with trying to beat them:

"I believe market efficiency is the proper —and safer —starting point for thinking about markets and investing; then get fancy if you must!"

grantspub.com/files/presenta…
My version of EMH is:

"markets are mostly efficient, and inefficient in a manner that is very difficult to exploit in a persistent manner over any reasonably judged time frame"
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